Sewing-machine.



A. E. JERRAM.

SEWING MACHINE.

APPLICATION mm JULY 18, 1912.

Patented NOV. 30, 1915.

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SEWING MACHINE.

APPLICATION FILED JULY 8, 1912. 1,162,697. Patented Nov. 30, 1915.

3 SHEETSSHEET 2.

A. E. JERRAM.

SEWING MACHINE.

APPLICATION FILED JULY 18. 1912.

Patented Nov. 30, 1915.

ARTHUR ERNEST JERRAM, OF LEICESTER, ENGLAND, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A, CORPORATION OF NEW JERSEY.

SEWING-MACHIN E.

Patented Nov. 30, 1915.

original application filed August 4, 1909, Serial No. 511,216. Divided and this application filed July 18, 1912. Serial No. 710,192.

To all whom it may concern:

Be it known that I, ARTHUR E. JnRRAM, a subject of the King of Great Britain, residing at Leicester, in the county of Le1cester, England, have lnvented certain Improvements in Sewing-Machines, of which.

the following description, in connection with the accompanying drawings, 15 a specification, like reference characters on the drawings indicating like parts 1n the several figures. I

The present invention relates to lock stitch sewing machines, and more part1cularly to a shuttle mechanism for such machines.

The primary object of the lnvent ion is to produce a lock stitch sewing machine having an improved shuttle mechanism which is simple in construction, reliable in operation, and is less liable to derangement than such mechanisms heretofore constructed.

With the above object in view, one feature of the invention contemplates the provision of a rotating shuttle provided wlth a protuberance to check the slack loop of needle thread after it has passed the body of the shuttle.

A further feature of the invention consists in the provision of a rotating shuttle comprising a frame and a thread case hinged to the frame and arranged so that the centrifugal tendency of said case holds the same in closed position on the frame.

Still further features of the invention relate to an improved and simplified mechanism for actuating the shuttle by which the shuttle is actuated in timed relation to the needle in a certain and satisfactory manner.

Still further features of the invention consist of certain constructions, arrangements and combinations of parts, the advantages of which will be obvious to one skilled in the art from the following de scription.

In the drawings illustrating the inventlon in the best form at present known to the inventor, Figure 1 is a side elevation of a sewing machine embodying the invention with portions of the casing broken away, and with certain of the parts shown 1n section; Fig. 2 is a view in front elevation of the machine; Fig. 3 is a view in rear elevation of the shuttle partly broken away; Fig. 4

, thereof adjacent the is a sectional elevation of the shuttle; Figs. 5, 6, 7, 8 and 9 are views illustrating the several stages in the operation of the machine in passing a loop of needle thread about the shuttle; and Fig. 10 is a detail VleW illustrating particularly the mechanism for operating the shuttle.

The machine illustrated in the drawings comprises a straight eye pointed needle 1 arranged with its thread carrying eye parallel with the line of the seam or the direction of feed which is reciprocated in a direction perpendicular to the work, and is also moved transversely to feed the work, a presser foot 2 for holding the work on the work table 3, a takeup 4 which acts to pull the thread from about the shuttle and set the stitch, and also to pull thread from a supply for the succeeding stitch, a thread lock 5 for locking the supply end of the thread during the stitch setting stroke of the takeup, a loop taking hook or deflector G for deflecting the needle loop into the path of the shuttle, an assistant feed plate 7 for engagement with the needle below the work to assist in feeding the work, and a stitch length measurer '8. The parts briefly re ferred to above are constructed, arranged and. operated as illustrated and described in applicants pending application Serial No. 511,216, of which the present application is a division. For a full and complete description of the above parts not fully described herein reference may be had to said application.

The loop taking hook 6 is arranged beneath the worktable 3 the level of the shuttle and, by means of suitable mechanism to be hereinafter described, is moved past the needle in a direction transverse to the needle and to the line of feed but inclined somewhat with relation to the shuttle axis as shown in F igi 1. After the needle has risen some distance from its lowermost position the loop which by the rising movement of the needle is thrown out from the needle upon the side loop taking hook 6 is engaged by the loop taking hook as shown in Fig. 5 and is deflected or drawn in a direction transverse to the plane of the shuttle and to the line of feed into the path of the shuttlebeak. The shuttle beak then engages the loop and pulls the thread through and preferably above the eye of the needle to draw out the loop of needle threadas shown in Fig. 6.

The shuttle of the machine, indicated at 9, is of the oscillatory type, and is arranged to rotate in a suitable raceway in the forward portion of the machine below thework table 3.

Referring particularly to Figs. 3 and 4, the shuttle comprises a thin disk or frame 10 which carries a thread! case or body 11 containing the locking tl i'ead. The frame is substantially cylindrical or disk shaped in form, but is cut away or recessed at 12 to form a beak or hook 13 for engagement with the needle loop, and is provided with a slight hump 13 and a convex face or protuberance 14 on the face of the recess opposite the hook to check the slack loop of needle thread after it has passed the body of the shuttle. The periphery of the frame is also cut away at 15 to provideclearance for the deflector 6 during its return movement to release the loop of needle thread. The thread case 11 is cylindrical in form and arranged with its cylindrical axis to one side of the axis of rotation of the shuttle and substantially in a plane parallel with the plane of rotation of the shuttle. The thread case is hinged at 16 to the frame on an axis which lies at one side of the plane parallel with the plane of rotation of the shuttle, and passing through the cylindrical'axis of the thread case. The thread case is held in closed position in the frame by a catch 17 actuated by a spring 18. By reason of the above described arrangement of the thread case with relation to the frame, the thread case is held in closed position on the frame by its centrifugal tendency during the rotation of the shuttle, in case the catch 17 becomes disengaged, or for any reason fails to act.

The shuttle reel 19 is carried on a spindle 2O fixed in the thread case, and the thread passes from the reel through a slot 21 in the thread case, passes under a tension-device 22, through a slot 23 and a hole 24: on the thread case to the work. The tension device 22 consists of a piece of sheet metal bent in the form illustrated in Figs. 3 and 4t, and pivoted at 16 to the frame 10. An adjusting screw 25 threaded into the frame 10 and engaging a downwardly projecting arm 26 on the tension device serves to regulate the pressure of the tension device on the thread. Close to the hole 24 in the thread case, and between said hole and the beak 13 of the shuttle, the thread case is' oscillatory movements are imparted to the shuttle by an oscillating shuttle driver 29 which fits in the recess 12 in the frame 10. The shuttle is oscillated through somewhat over three quarters of a revolution during the formation of a stitch. The deflector 6 is provided with a hook at its forward extremity for engaging the thread of gages a suitable cam groove 11 in the cam disk 41.

The different stages in the operation of the shuttle and needle during the passing of the loop of needle thread about the shuttle are illustrated in Figs. 5 to 9 inclusive. After the needle has reached the limit of its work piercing stroke it rises a slight distance to throw out a loop of thread to be engaged by the loop taking beak or hook 13 of the shuttle. The thread is then engaged by the deflector (3 and moved across the path of the shuttle beak. In Fig. 5 the parts are illustrated with the loop engaged by the defiector, and the beak of the shuttle about to enter the needle loop. Further rotary movement of the shuttle causes its beakvto engage the needle loop and pull the thread through the eye of the needle at an angle of approximately 15 to the line of penetration of the needle, as illustrated in Fig. 6. Suflicient thread is pulled through the eye of the needle toenable the thread case to pass through the loop before the continued movement of the beak 13 of the shuttle carries the thread into such a position that it slips inward along the slight hump or projection 13 on the frame inside the beak. As this occurs, the forward end of the thread case engages the loop and expands it, as illustrated in Fig. 7, and the thread case passes through the loop without pulling any further thread through the needle eye. When the shuttle driver starts on its retrograde movement, sufficient clearance is produced between the front face of the driver and the adjacent face of the shuttle to enable'the loop to be pulled up in the usual way by the takeup to tighten the stitch. The hump or protuberance 11 on the shuttle frame serves to check the slack loop of needle thread after it has passed the body of the shuttle.

The shuttle driver 29 is mounted on an oscillating shaft 30 which is arranged in alinement with the axis of the shuttle and is provided with an arm 31 at its rear end which is slidably connected with one end of a lever 32 by means of a block 33 pivoted to the link and received in a slot in the arm. The lever 32 is arranged to slide in a block 34 pivoted on a pin 35 mounted in a fixed portion of the frame, the lever being formed with alongitudinal slot 36 through which the pivot pin 35 passes. The lever 32 is pivoted at its other end to a lever 37 fulcrumed at 38 on the frame of the machine, and carrying at its upper end a cam roll 39 arranged to engage a cam groove in the face of the cam disk 41. When the lever 37 is oscillated about its fulcrum, the lever 32 is rotated about the pin 35, and is simultaneously moved longitudinally along said pin so that the pin constitutes a variable fulcrum for the lever. By means of this connection between the lever 37 and the shaft 30, the required angular movement of the shuttle driver is secured in a satisfactory manner by a relatively small angular movement imparted to the lever 37 by the cam disk 41.

To avoid any liability of the deflector 6 engaging the shuttle thread, a projection or bar 42 is provided which prevents the shuttle thread from being engaged by the hook of the deflector as the hook returns toward the shuttle. This bar engages the shuttle thread and prevents the blunt end of the hook from thrusting the thread away from the shuttle as the hook returns.

The nature and object of the invention having been explained, and a machine embodying the same in its preferred form having been specifically described, what is claimed is:

1. A lock stitch sewing machine, having, in combination, a needle, a rotary shuttle comprising a frame and a thread case hinged to the frame and arranged with relation to the frame so that the centrifugal tendency of said case holds the same in closed position.

2. A lock stitch sewing machine, having, in combination, a needle, and an oscillating shuttle provided with a hump to check the slack loop of thread after it has passed the body of the shuttle.

3. A lock stitchsewing machine, having,

in combination, a needle and a discoidal rotary shuttle comprising a frame and a cylindrical thread case arranged so that its cylindrical axis does not intersect the axis of the shuttle but lies in a plane substantially parallel with the plane of rotation of the shuttle hinged to the frame on an axis located with relation to the thread case so that the centrifugal tendency of said case. holds the same in closed position.

4:. A lock stitch sewing machine, having, in combinationfa needle and an oscillating shuttle provided with a recess to form a hook for engagement with the needle loop and with a hump on the side of the recess opposite the hook to check the slack loop of needle thread after it has passed the body of the shuttle.

5. A lock-stitch sewing machine having, in combination, a needle, an oscillating shuttle, a shuttle driver, an oscillatory member upon which the shuttle driver is mounted, a lever connected at one end with the shuttle driver, a fixed fulcrum upon which said lever is mounted to slide lengthwise of the lever, and a cam lever pivotally connected with the other end of the first lever.

6. A lock stitch sewing machine, having, in combination, a needle, an oscillating shuttle, a shuttle driver, a lever, means for oscillating said lever, and connecting mechanism comprising a second lever having a fulcrum which is variable in position with relation to the lever for oscillating the shuttle driver from the first lever.

7. A lock stitch sewing machine, in combination, a needle, an oscillating shuttle, a shuttle driver, mechanism for oscillating said shuttle driver comprising a lever, means to oscillate said lever, a second lever pivotally connected with the first lever and having a sliding connection with the shuttle driver, and a variable fulcrum for the second lever.

8. A lock stitch sewing machine, having, in combination, an eye pointed needle, a shuttle arranged to rotate in a plane substantially parallel to that of the loop of thread forced through the work by the needle, a deflector arranged to engage the loop of needle thread and move it into position to be engaged by the shuttle, and a device for preventing saiddeflector from engaging the shuttle thread.

9. A lock stitch sewing machine, having, in combination, a needle, a discoidal shuttle comprising a frame and a cylindrical thread case arranged so that its cylindrical axis lies substantially in the central plane of the shuttle but is located at one side of the axis of the shuttle, said case being hinged to the frame upon an axis which lies without said plane and at the same side of the axis of the having,

.shuttle, so that the centrifugal tendency of said case holds the same in closed position. In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR ERNEST JERRAM. WVitnes'ses:

FREDERICK WVILLIAM lVonTH, JOHN RICHARD Law. 

